stone



(No Model.)

R 0. STONE. ELECTRICAL CONDUCTOR.

Patented Mar. 18, 1884.

WI-messes N. FEYEH Phomlulhngnpher. Wadinglml. D- c.

7 UNrTEn STATES PATENT EEIQ noss o. STONE, on NEW YORK, n. Y.

ELECTRICAL CONDUCTOR.

SPECIFICATION forming part of Letters Patent No. 295,207, dated March 18, 1884.

d I Application filed August 9,1883. (No model.)

To all whom it may concern Be it known that 1, Ross 0. STONE, of the city, county, and State of New York, have invented a certain new and useful Improvement in Electrical Conductors and Mode of Constructing the same, of which the following is a specification.

The object of my invention is to so combine the superior tensile strength of steel or other material as a support with the superior conductivity of copper or other material, as to produce a conductor of electricity with greatest conductivity and least weight and cost.

My invention consists in a method of twisting or stranding together wire of greatest tensile strength with the wire of greatest conductivity so galvanized as to preserve these qualities under all conditions of use under or above ground, and in the wire or conductor produced by said method. A wire of great tensile strength, preferably steel, is used as the main support, but not as the electrical conductor. A wire of great conductivity, as copper, is used for the conductor. These two wires are as near as may be of the same crystallization, so that expansion and contraction may be equal. Thus, with a tempered steel wire I would use a different quality of copper than with an untempered wire, and so on. The combination is to be protected by galvanizing or covering each wire with a coating of zinc or tin, each wire of the strand and the strand itself being protect-ed with a lead cushion or deposit on the stranded wires that shall permit of any usual undulations or bending without cracking or'breaking any galvanized part of either wire, and a'galvanization of the lead covering that shall protect it from ordinary abrasion.

In order that my invention may be thoroughly understood, I will proceed with reference to the drawings, in which Figure 1 is an enlarged section of the wire, showing one galvanic coating. Fi 2 is a similar view, showing the second coating. Fig. 3 is a section of the compound wire having external covering to the conducting and supporting wires. Fig. 4 is a view of a short section of the two wires stranded together.

A is a wire or rod of steel or other metal of great tensile strength. This wire may be slightly flattened in the drawing, or be rolled slightly flat after drawing, if found desirable; or it may be a round wire. This wire is galvanized, the coating being designated by O.

B is a wire or red of about the same sizeas A. This wire is composed of a metalof great conductivity, as copper, and also has a galvanic coating or covering, as at O.

The wires A B are placed side by side and twisted or stranded together. A second galvanized coating, D, is now applied to the two wires. (See Fig. 2.) The compound wire may in some instances be used in this shape. I prefer, however, to give further protection to the stranded wires in the following manner: I pass thewire through a bath of lead, or apply lead in other known ways, to form a cushion and protection to the wires, to protect them from outside influences, atmospheric or other. E represents the lead so applied as to fill the spaces and round out the wire. As a still further protection, more especially for the lead covering, I may apply a coating of tin, or galvanize the wire in the usual way.

Instead of lead, I may use a soft-metal alloy as a covering for the wires.

I have referred to the wires as being galvanized. It is apparent that it is immaterial by what process the wires may be coated. I con sider all tinned or coated wires the equivalent of my galvanized wires.

It will be seen that the wires A B, one of i great strength and the other of great conductivity, are each first protected from the weather and from chemical action upon each other by the first coating 0. Being twisted. the one upon the other, they are capable of expansion and contraction together. The second coating D unites the two, and serves to further protect them. The lead covering gives still further protection and serves as a cushion to prevent abrasion. This covering may be as thick as found desirable, and need not necessarily fill the spaces between the wires. The supportingwire, being of great tensile strength, but not being intended for a conductor, is made to carry as great a quantity of conducting-wire as possible, either by increasing the size'or the number of the conducting-wires.

I am aware that a galvanized core round which a spiral ribbon of copper is coiled is not' new. Such have been patented wherein the copper strip or ribbon has been galvan- IOO ized, then wound about the core, and then the two galvanized. Such I do not claim.

\Vhat I claim is- 1. The method herein described olconstructing an electrical wire or conductor, which eonsists in twisting together-two galvanized wires, then coating and uniting the two by a galvanized coating, substantially as stated.

2. The method herein described ofconstruct ing an electrical wire or conductor, which con sists in twisting together two galvanized wires, covering the same with a galvanic coating, then covering the whole with a coating of lead or similar metal, substantially as described.

3. The electrical wire or conductor herein described, consisting of wire A, of great strength, and wire 1 of great conductivity, each wire having a separate coating, and the two stranded together and covered by a second coating of metal, substantially as described.

4. The electrical. wire or conductor herein described, consisting of steel wire, as A, and copper wire, as 13, both wires having a metal- ,lie coating, and the two stranded together, and having a galvanic coating over said strand, and the lead covering for the wires and their coatings, as set forth.

5. The combination, in an electric wire or conductor, of galvanized steel wire A. and galvanized copper wire 3, the two being twisted together and covered by a galvanic coating, and having a lead covering, E, and tin coat ing 1*, all being arranged with relation to each other, substantially as shown and described.

In testimony whereof I allix my signature in presence of two \Villl'lCSSOS.

ROSS (I. STONE.

"\\"'itnesses: 

